________ a certain doubt among the people as to the practical value of the project.
--- In what way will you use your portable computer?--- I’ll use it _____ for giving lectures at home and abroad.
The teacher set such difficult problems ______ nobody could work out _____ none of us passed the test.
By the time I see you again, I _______ from that school.
— Shall we have our Christmas tree decorated? —_____ . I think it’s fine as it is.
A new kind of drug ___ ___ to cure H7N9 bird flu by the scientists and they are hopeful that they will succeed in a couple of weeks.